Gas circuit breaker

Abstract

A gas circuit breaker includes movable and fixed electrode parts arranged to face each other in an engaging/separating manner in a container filled with an insulating gas, an operating mechanism attached to a partition of the container and configured to output an operating force to the movable electrode part, an operating rod attached to the movable electrode part, a first link rotatably attached to the operating rod, a lever rotatably attached to the first link, a support bearing fixed to the partition of the container via an insulating spacer, a second link rotatably attached to the lever and also rotatably attached to the support bearing, a seal bearing connected through the partition of the container, a seal rod rotatably attached to the center of the lever and slidably supported to the seal bearing, and a third link rotatably attached to the seal rod and also attached to the operating mechanism.

What is claimed is: 
     
       1. A gas circuit breaker comprising:
 a movable electrode part and a fixed electrode part which are arranged to face each other in a manner where they engage and separate in a container air-tightly filled with an insulating gas; 
 an operating mechanism attached to the outer side of a partition of the container and configured to output an operating force from an output part to the movable electrode part; 
 an operating rod including one end attached to the movable electrode part; 
 a first link including one end rotatably attached to the operating rod; 
 a lever including one end rotatably attached to the first link; 
 a support bearing which is fixed to the partition of the container via an insulating spacer; 
 a second link including one end rotatably attached to the lever and the other end rotatably attached to the support bearing; 
 a seal bearing configured to penetrate through the partition of the container; 
 a seal rod which is rotatably attached to the lever in the vicinity of the center of the lever and is slidably supported to the seal bearing; and 
 a third link including one end rotatably attached to the seal rod and the other end attached to the output part of the operating mechanism. 
 
     
     
       2. The gas circuit breaker of  claim 1 , wherein, when the electrode parts are in a closing state, a central line of the first link along a longitudinal direction intersects an operating axial line of the seal rod at the seal rod side with respect to the lever, and a central line of the second link along a longitudinal direction intersects the operating axial line of the seal rod at the operating rod side with respect to the lever. 
     
     
       3. The gas circuit breaker of  claim 1 , wherein, when the electrode parts are in a closing state, a central line of the first link along a longitudinal direction intersects an operating axial line of the seal rod at the seal rod side with respect to the lever, and a central line of the second link along a longitudinal direction is substantially in parallel to the operating axial line of the seal rod. 
     
     
       4. The gas circuit breaker of  claim 1 , wherein a guide plate having a long opening is fixed to the partition, a connection pin is attached to a connection portion of the lever and the seal rod, the connection pin is slidably inserted in the long opening of the guide plate, and the longitudinal direction of the long opening coincides with a direction of linear movement of the seal rod. 
     
     
       5. The gas circuit breaker of  claim 4 , wherein a guide roller is rotatably attached to the connection pin and is slidably connected to the long opening of the guide plate. 
     
     
       6. The gas circuit breaker of  claim 1 , wherein the first link is made of an insulating material. 
     
     
       7. The gas circuit breaker of  claim 1 , wherein an insulating spacer is interposed between the support bearing and the partition of the container. 
     
     
       8. The gas circuit breaker of  claim 1 , wherein an elastic body is used for a driving source of the operating mechanism. 
     
     
       9. The gas circuit breaker of  claim 1 , wherein a hydraulic system is used for a driving source of the operating mechanism.